Portable power supply



FIG. 1 is a top, front, right side perspective view of a portable power supply showing my new design;

FIG. 2 is a top, rear, left side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a right view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is an enlarged view of the selected portion 9 in FIG. 7;

FIG. 10 is an enlarged view of the selected portion 10 in FIG. 1; and,

FIG. 11 is an enlarged view of the selected portion 11 in FIG. 2.

The broken lines shown in the figures depict portions of the portable power supply that form no part of the claimed design. 

CLAIM The ornamental design for a portable power supply, as shown and described. 